Where can I go to download the latest patches for SM9.51 and to download SM9.52 and it's patches?
Interesting. I had a look and there were no patches for SM 9.51. Went straight to SM 9.52. I checked https://softwaresupport.hpe.com/group/softwaresupport/search-result/-/facetsearch/document/KM02688311 and search patches and went through my sm 9.51 update bulletins.
Go for SM 9.52 patch, it should not be too much a differences between 9.51 and 9.52P1. You can find it at KM02688311.